168 



PLATHELMINTHES 



egg capsules attached by a slender pedicle : 2 genera and 4 species, para- 

 sitic or commensal on the gills and outer surface of Limulus polyphemus. 

 1. BDELLOURA Leidy. Anterior end tapering; posterior end wide, 

 with a glandular disc for attachment: 3 species. 



B. Candida (Girard) (Fig. 272). Body 15 mm. long, 

 4 mm. wide, gray in color; egg capsule 2.5 to 4 mm. long; 

 testicular sacs 60 to 100 in number: often very common. 

 B. propinqua Wheeler. Body 8 mm. long; testicular 

 sacs about 170 in number; egg capsule 1.25 mm. long; not 

 so common 'as the above. 



B. wheeleri Wilhelmi. Body 6 mm. long, 1 mm. wide, 

 the greatest width being in front of the pharynx; sucker 

 not set off from body: on Limulus; not common. 



2. SYNCCELIDIUM Wheeler. Body elongate, tapering 

 towards both ends, which are blunt; posterior rami of intestine unite, 

 forming a single median trunk: 1 species. 



S. pellucidum Wheeler (Fig. 273). Body 3 mm. long; testicular fol- 

 licles large, about 14 on each side of the body ; egg capsules 

 .75 mm. long. 



SUBORDER 3. TERRICOLA.* 



Land planarians. Intestinal branches simply lobed; 

 position of mouth variable; uterus small, behind the genital 

 pore; body oval or elongate, and usually brightly colored, 

 and with a creeping sole on the ventral surface : 5 families 

 and about 400 species which occur mostly in 

 tropical countries, living in damp places. 



Fig. 272 

 Bdelloura 



Candida 

 (Verrlll). 



Pig. 273 



Synccelidium 



pellucidum 



(Wheeler). 



FAMILY 1. BIPALIIDAE. 



Body often very elongate, usually brightly colored, and 

 with longitudinal or transverse stripes ; head end broadened, 

 forming plate with numerous marginal eyes; mouth median 

 or post-median ; genital pore ba,ck of mouth : 4 genera and 

 about 90 species. 



PLACOCEPHALUS von Graff. Body often enormously 

 elongate; head plate thin, much broader than long, and 

 with a semicircular margin: 15 species. 



P. kewensis (Mosley) (Fig. 274). Body 10 to 20 cm. 

 (in some cases 45 cm.) long, narrow and with parallel sides, 

 yellowish in color; with 7 longitudinal stripes; sole white: greenhouses in 

 America and Europe; native country unknown, although possibly Samoa. 



* See "Monographic d. Turbellarien, II. Tricladida terricola," by L. von Graff, 

 Leipzig, 1899. 



Fig. 274 



Placo- 



cephalus 



kewensis 



(von Graff). 



